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3d+10=d+12
We move all terms to the left:
3d+10-(d+12)=0
We get rid of parentheses
3d-d-12+10=0
We add all the numbers together, and all the variables
2d-2=0
We move all terms containing d to the left, all other terms to the right
2d=2
d=2/2
d=1
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